Hinge for school-seats



(No Model.) 2 Sheets--Sheet 1.

o. s. GARRETSON. HINGE POR SCHOOL SEATS.

No. 425.098. Patented Apr. 8. 1890.'

a waww zm (No Model.) 2 Sheets-Sheet 2.

.o. S. GARR ETSON. HINGE FOR SGHOOL SEATS.

No. 425,098. Patented Apr. 8. 1890.

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UNITED STATES PATENT OFFICE.

OLIVER S. GARRETSON, OF BUFFALO, NEYV YORK.

HINGE FOR SCHOOL-SEATS.

SPECIFICATION forming part of Letters Patent N o. 425,098, dated April 8, 1890.

Application filed February 23 1883. Serial No. 85 ,887. (No model.)

To all whom it may concern:

Be it known that I, OLIVER S. GARRETSON, of the city of Buffalo, in the county of Erie and'State of New York, have invented new and useful Improvements in Hinges for School-Seats, of which the following is a specification.

This invention relates to an improvement in the Construction of hinges for school-seats and similar hinged seats, and has for its object to produce a strong and durable hinge which shall be noiseless in its operation, and which does not become loose by long-continued use, and which permits the seat to move easily in raising and lowering it.

My invention consists of the peculiar construction of the hinge, which Will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawing-s, consisting of two sheets, Figure 1 represents a side elevation of my improved hinge, and Fig. 2 is a similar View with the cap and spring removed and the seat raised. Fig. 3 represents a similar View showing the seat lowered. Fig. 4 is a cross-section, on an enlarged scale, of the hinge in line 93 m, Fig. l. Fig. 5 is an inside View of the knuckle of the seat. Fig. 6 is an outside view, and Fig. 7 an inside View, of the frame or standard. Fig. 8 is an inside View of the cap. Fig. 9- represents a View of the concave side, and Fig. 10 a View of the conveX side, of the Washer. Fig. 11 is a View of the spring. Fig. 12 is an end View of the Washer on an enlarged scale. Fig13 is a cross-section, on an enlarged scale, in line y y, Fig. 7. Fig. 14: is an edge View of the cap.

Like letters of reference refer to like parts in the several figures.

A represents the seat of a school-desk or other similar piece of furniture, and B represents one of the arms, to which the wooden portion of the seat is Secured.

B' represents the knuckle formed at the inner end of the arm B.

C represents' the standard or stationary frame which supports the seat, and C' is the knuckle formed at the upper portion c of the standard and arranged on the inner or rear side of the seat-knuckle B'.

D represents a curved recess or depression formed on the inner side of the seat-knuckle B' and terminating in two shoulders d d', as clearly shown in Fig. 5.

CP represents a conveX hearing-surface arranged concentrically in the recess D on the inner side of the knuckle B', and extending around the central aperture (1 through which passes the fastening-bolt E of the hinge.

The knuckle C' is constructed on its outer side with a concave hearing-surface f, which fits against the conVeX hearing-surface (1 of the knuckle B', as clearly shown in Fig. 4. These convex and concave hearing-surfaces serve to center the -seat -knuckle on the knuckle of the standard and to relieve the central fastening-bolt of lateral strains, and they permit the knuckle C' to be loosely fitted in the recess D of the knuckle B', thereby avoiding friction between the inner curved wall of the recess D and the outer peripheral surface of the knuckle C'. The latter is constructed with an outer peripheral surface which moves in the recess D of the knuckle B', and`which terminates in two shoulders g' 9 The latter come in contact with the shoulders d d' of the knuckle B' when the seat is lowered and support the same in its lowest position.

h represents a peripheral surface of the knuckle C', extending downward from the base of the shoulder g', and forming a space through which the shoulder (Z moves downward as the seat is raised, the surface h being curved with a smaller radius than the surface g. WVhen the seat reaches its highest position, a shoulder h', extending rearwardly from the tip of the shoulder d, comes in contact with the rear side of the standard C and arrests .the upward movement of the seat.

I represents the Washer arranged on the inner side of the knuckle C', and made convex on the side contiguous to said knuckle and concaveon its opposite side. The inner side c of the knuckle C', against which the Washer I bears, is made concave to form a seat for the conveX side i of the Washer I.

ti represent two arc-shaped recesses formed on the inner side of the knuckle C' concentric With the fastening-bolt E, and made of a length corresponding with the angular movement of the seat-knuckle in raising and lowering the seat.

The Washer I is provided with two lugs jj,

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arranged diametrically opposite each other ,and projecting into the recesses z' i from the convex side of the Washer. The lugs j j are construeted with inelined faces j', which come in contact with the inclined ends ot' the recesses t' 'i just before the seat reaehes the end of its movement, and thereby prevent the shoulders of the two knuckles from coming in contact with each other in a sudden or abrupt manner.

K represents a cap applied to the inner side of the knuekle B' on both sides of theknuckle C', and which extends across the latter and the Washer I. The cap K is provided at each end with projections k, which engage in corresponding recesses formed in the knuckle B', and whereby the cap is prevented from changing its position with reference to the knuckle B'. The cap K is provided on its inner sido with a rccess Z, in which the 'asher I fits snugly, and in which said Washer is held against movement with reference to the cap K, so that the knuekle B', the cap K, and the Washer I remain in the same relative position during the movements of the seat. Thelugs i of the washer rest in recesses k' of the cap K and hold the body of the washer away from the cap, as clearly represented in Fig. 4:.

m represents a plate of steel or any other suitable spring arranged in the recessZ between the Washer I and the cap K. The eap K is constructed with a raised portion 92, surrounding the opening n' ot' the washer, through which the fastening-bolt E passes and hearing against the central portion of the elastic plate m. The corners of the elastic plate m bear againstthe body of the washer, as clearly represented in Fig. i.

O represents a screw-unt applied to the inner side of the fastening-bolt E on the inner side of the eap K. Bytightening the fastening-bolt E the parts constituting 'the hinge are drawn together, and the elastic plate m is Sprung to a greater or less extent, thereby regulating the resistance which the hinge opposes to the movement of the seat.

In raising or lower-ing the seat the concave and convex bearingsurfaees of the knuckles B' C' and washer I form the only bear-ingsurfaces on which the hinge turns and permit the parts to center themselves to the axis of movement, thereby enabling the parts to nove freely and without bindin g.` The knuckle B' and the Washer I, spring m, and cap K nove together upon the knnckle C'.

Just before the seat reaches either extreme of its movement the nclined faces j' of the lugsj of the washer come in contact With the inclined ends t" of the reeesses 1', whereby the Washer I is slightly forced away from the knnckle C', thereby compressing the spring m and preventing any hard impact of the shoulders of the knuckles, which come in contact with each other when the seat reaches the extreme of its movement in either direction.

I claim as my nventionl. The combinationwith the seat-arm B, having a knuckle B', provided with a convcx surface d, and the standard C, having a knuckle C', provided on its outer side with a eoncave surface f, which bears against the convex surface (Z of the seat-knuckle, and on its inner side with a concave seat 0 and curved recesses i, of a Washer I, provided with a eonvex side i which bears against the coneave seat 0 of the knuckle C', and having lugsj, which are seated in the recesses e', and a cap K, provided with reeesses 75', which receive the lugs j of the Washer, substantially as set forth.

9. The combination, with the seat-arm having a knuckle B' and the standard having a knuckle C', of the recessed Washer I, springplate m, seated in the recess of said Washer, and the eap K, hearing only against the central portion of said spring-plate andrleaving the ends of said plate free, substantially as set forth.

3. The combination, with the seat-arm B, having a knuckle B', provided with a eonvex bearingsurface LZ and stops (l (Z', and the standard C, having a knuckle C', provided with a coneave bearing-surfacefiwhich bears against the eonvex surface d* of the seatknuckle, steps g' 1 which engage against the steps (Z d', and curved recesses i, having inclined ends 'i', of a Washer I, provided with lugsj, having inelined faces j' and seated in the reeesses l a spring-plate m, seated in a recess formcd in the Washer, and a cap K, provided with a raised central portion n,which bears against the central portion of the springplate, and with reeesses k', which receive the lngsj of the Washer, substantially set forth.

OLIVER GARRETSON.

witnesses:

JNo. J'. BONNER, UHAs. F. GEvEn.

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